function math 8
TRANSCRIPT
Function- a relationship in which each input has exactly one outputFunction Rule- the operations applied to the input (the rule is the equation that represents the function)
Input(x value)
Equation(function
rule)
Outputf(x)
10 f(x) = x + 10 20We can read this as….
f of 10 equals 10 + 10Or
f of 10 is 20
What we plug in
What we plug it into
What we get
Input Function rule OutputX f(x) = x2 + 2 f(x)1 f(1) = 12 + 2 323
f(2) = 22 + 2 6f(3) = 32 + 2 11
Fill in the missing values
A theater teacher thinks that the number of seniors in a school play should depend on the number of juniors in the play. The table below represents the number of juniors and seniors who performed in four different school plays.
1. Find the pattern from juniors to seniors.x
juniorsf(x)
seniors14 716 818 920 10
The number of seniors is half the number of juniors. Write this equation.
The function is …… f(x) = ½ xFind f(18) by using the table
f(18) is f(18) = ½ (18) = 9
In a restaurant, the manager observes the number of people inside and the number of cars in the parking lot at different times in the day. He comes up with the following table.
cars outside people inside9 2710 3011 3312 36
Determine the function rule by finding the pattern in the above table.
f(x) = 3xFind f(10)
F(10) = 3(10) = 30
Function- a relationship in which each input has exactly one output
x – input f(x)-output12 -68 -33 23 29 312 6
Does each input have exactly one output?Nope…… 12 has two different outputs
Does this table show a function?
Class work: In your workbooksp. 30-32 1-8
What you don’t finish in class will be finished for homework.
Write you answers on a separate sheet of paper.